- PVC box (optional external aluminum front plate)
- curtain type: aluminum filled with polyurethane foam or PVC
- aluminum and PVC guides
- maximum construction depth of the window frame for a inspection flap at the bottom: 80 mm
- inspection flap from the forehead and from the bottom
- box shape: rectangular
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An alternative solution that allows access to the inside of the box from the front and bottom sides, from inside of the building. Additionally it is possible to install a mosquito net on the inside of the curtain. Provides increased thermal and acoustic insulation.